How to reduce (Tweak) Synology Rebuild time - Use at your own risk!

echo 90 > /proc/sys/vm/dirty_ratio
echo 80 > /proc/sys/vm/dirty_background_ratio
echo 6000 > /proc/sys/vm/dirty_expire_centisecs
echo 4000 > /proc/sys/vm/dirty_writeback_centisecs

For the next two, change "sda" to the device name; you may need to repeat for each device.
echo deadline > /sys/block/sda/queue/scheduler
echo 16384 > /sys/block/sda/queue/nr_requests

For the next two, change "md2" to the volume name if different; you may need to repeat for each volume.
echo 524288 > /sys/block/md2/md/stripe_cache_size
blockdev --setra 4096 /dev/md2

The following line can only be enabled while the array is healthy
mdadm --grow /dev/md2 --bitmap=internal

Edit /etc/sysctl.conf to add this line
dev.raid.speed_limit_min=100000

Have multiple fields in excel to compare and output results? Use vlookup in excel

--- Start of Rant ---

Let me tell you something. Sometimes in IT you're stuck with an unenviable task of scripting mass changes to AD, you've got the starting point - the requirements and the objects that need to be changed, you have somehow managed to extract the data required to be changed. Now you need to eye-ball both spread sheets line by line to make sure you can produce the script that will update the required attributes.

It's not fun.

--- End of Rant ---

With this it will be fun:
http://www.techonthenet.com/excel/formulas/vlookup.php

Things to take note of before messing with vShield

vShield adds this line to each VM's .vmx file.

ethernet0.filter0.name = “vshield-dvfilter-module”
ethernet0.filter0.param1 = “uuid=52393e32-ee4f-4420-808d-dd2683015301.000″

Resolving network address conflict after P2V Windows 2003/XP to VMware

set devmgr_show_nonpresent_devices=1
start devmgmt.msc

http://freneticrapport.blogspot.sg/2011/05/windows-hiddennot-connected-device.html

Find files based on date of last write change using DIR command

dir /s /a /O-D /TW | find "27/06/2013" | more

Debugging scripts, output to console

Example 1

--- Script start ---

if not exist c:\Logs md c:\Logs
net use \\sourceserver\robocopy /user:username password 1>c:\Logs\test.txt 2>&1

--- Script end ---

"1>c:\Logs\test.txt 2>&1"

"1>" To capture error output; specify a full path for the log file. If not it might end up in the System32 folder.

"2>" = re-direction in DOS Command Prompt (console)

Example 2

--- Script start ---

net use \\sourceserver\robocopy /user:username password 1> c:\output.txt 2> c:\error.txt
dir \\sourceserver\robocopy 1>> c:\output.txt 2>> c:\error.txt

--- Script end ---

Or to use one single log file:

--- Script start ---

net use \\sourceserver\robocopy /user:username password 1> c:\output.txt 2>&1
dir \\sourceserver\robocopy 1>> c:\output.txt 2>>&1

--- Script end ---


References:
http://social.technet.microsoft.com/Forums/en-US/ITCG/thread/b591346e-3ed0-4ed1-9453-24851ebe1bb1

Schedule a robocopy task on Windows 2008 R2 (WIP)

Objective:
1. Schedule a task to copy a set of files from a DC to another DC.
2. Apply least privilege principle.

Environment:
Windows 2008 R2 (
Robocopy version on Windows 2008 R2 (XP10 aka 5.1.10.1027)

Symptoms:
Using robocopy, you will be able to copy folders from source location to destination location (folders will be created). However, files within the source folder will fail to copy.

Common errors:
1. ERROR : You do not have the Manage Auditing user right.
2. ERROR 5 (0x00000005) Copying NTFS Security to Destination Directory -instead-path-here- Access is denied.

Required Permissions:

To use the robocopy /COPYALL switch on a DC, at minimum, user account MUST BE in "Builtin\Administrators" group.

THIS CAN'T BE AVOIDED. Ref URL #4 below - "UAC operates under a dual token method where even if you have the right to have elevated access, until you request it via UAC its not provided. Once requested its a new process."

Tried to minimize security access with credentials "Builtin\Server Operators" (able to open an elevated command prompt but UAC will prompt for password) and "Builtin\Backup Operators"
However, with these credentials, during the copy process, the folders will be created successfully but files inside folders, you will hit error #2 mentioned above.


Required NTFS Permissions

1. Source location, at least read access to the files and folders
2. Destination location, "full control" to files and folders (If not you may have
3. If your destination folder is in a root folder, ie, D:\ or E:\, you will need to
3.1. Disable inheritance
3.2 Grant full control to the user that is used to run the robocopy scheduled task script

Windows 2008 R2 may not copy ACLs properly
Workaround:

1. XCOPY source_folder target_folder /I /E /X /T 
2.  ROBOCOPY source_folder target_folder /COPYALL /SECFIX /E 

References:
1. http://ss64.com/nt/robocopy.html
2. http://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/292b40ec-a6b3-47db-b9ac-e7ab9aa5c913
3. http://serverfault.com/questions/419835/what-permissions-are-required-to-back-up-to-a-remote-folder
4. http://superuser.com/questions/416188/is-there-any-way-to-elevate-a-command-prompt-in-windows-7
5. http://support.simplefailover.com/KB/a5/using-robocopy-with-simple-failover.aspx
6. http://virtualmowfo.blogspot.sg/2009/07/running-scheduled-task-using-system.html